perf_events, trace: Fix perf_trace_destroy(), mutex went missing
Steve spotted I forgot to do the destroy under event_mutex. Reported-by: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> LKML-Reference: <1274451913.1674.1707.camel@laptop> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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@ -132,8 +132,9 @@ void perf_trace_destroy(struct perf_event *p_event)
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struct ftrace_event_call *tp_event = p_event->tp_event;
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int i;
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mutex_lock(&event_mutex);
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if (--tp_event->perf_refcount > 0)
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return;
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goto out;
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if (tp_event->class->reg)
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tp_event->class->reg(tp_event, TRACE_REG_PERF_UNREGISTER);
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@ -157,6 +158,8 @@ void perf_trace_destroy(struct perf_event *p_event)
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perf_trace_buf[i] = NULL;
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}
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}
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out:
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mutex_unlock(&event_mutex);
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}
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__kprobes void *perf_trace_buf_prepare(int size, unsigned short type,
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